Trichloroberyllat‐Komplexe von Dimethylcyanamid, Morpholin und 4,4′‐Bipyridin

Trichloroberyllate Complexes of Dimethyl Cyanamide, Morpholine, and 4,4′‐Bipyridine The trichloroberyllate complexes (Ph 4 P)[BeCl 3 (NCNMe 2 )] ( 1 ), (Ph 4 P)[BeCl 3 {HN(CH 2 ) 4 O}] ( 2 ), and (Ph 4 P) 2 [(BeCl 3 ) 2 (4,4′‐bipy)] ( 3 ) were prepared by reactions of (Ph 4 P) 2 [Be 2 Cl 6 ] with dimethyl cyanamide, trimethylsilylmorpholinate, and 4,4′‐bipyridine, respectively, in dichloromethane solutions. 1 ‐ 3 were characterized by X‐ray crystallography and by IR‐spectroscopy. 1 ·CH 2 Cl 2 : Space group P1, Z = 1, lattice dimensions at 173 K: a = 714.2(1), b = 919.5(2), c = 1233.4(2) pm, α = 94.97(1)°, β = 90.86(1)°, γ = 111.90(1)°, R 1 = 0.0310. In the complex anion [BeCl 3 (NCNMe 2 )] − the dimethyl cyanamide ligand is coordinated via a linear Be–N≡C‐NMe 2 arrangement, the CH 2 Cl 2 molecules forming linear chains by hydrogen bridges ···HCH···Cl··· with the chlorine atoms of the {BeCl 3 − } groups. 2 : Space group $P{\bar 1}$ , Z = 2, lattice dimensions at 173 K: a = 1050.9(1), b = 1099.7(1), c = 1308.3(2) pm, α = 87.57(1)°, β = 70.97(1)°, γ = 74.58(1)°, R 1 = 0.0397. The complex anions are dimerized by centrosymmetric puckered eight‐membered [Be–N–H···Cl] 2 rings. 3 ·2CH 2 Cl 2 : Space group $P{\bar 1}$ , Z = 2, lattice dimensions at 173 K: a = 1095.4(1), b = 1559.6(2), c = 1869.8(3) pm, α = 79.12(1)°, β = 73.83(1)°, γ = 78.76(1)°, R 1 = 0.0548. The complex contains dianions [Cl 3 Be(μ‐bipy)BeCl 3 ] 2− with Be–N distances of 177.0(6) and 178.5(6) pm. Both {BeCl 3 } − groups form C–H···Cl hydrogen bridges with the dichloromethane molecules.